球墨铸铁轧辊表面镍基激光合金化层及其磨损性能

doi:10.13251/j.issn.0254-6051.2020.06.046

金属热处理 ›› 2020, Vol. 45 ›› Issue (6): 220-225.DOI: 10.13251/j.issn.0254-6051.2020.06.046

球墨铸铁轧辊表面镍基激光合金化层及其磨损性能

王硕煜¹, 张林², 解明祥¹, 叶文虎¹

1. 安徽马钢表面技术股份有限公司, 安徽马鞍山 243021;
2. 安徽工业大学现代表界面工程研究中心, 安徽马鞍山 243000

收稿日期:2019-12-24 出版日期:2020-06-25 发布日期:2020-09-02
作者简介:王硕煜(1966—),男,高级工程师,主要研究方向为冶金备件的表面强化与再制造,E-mail:kingashuo@139.com

Ni-based laser alloyed layer on ductile iron roller surface and its wear properties

Wang Shuoyu¹, Zhang Lin², Xie Mingxiang¹, Ye Wenhu¹

1. Anhui Ma Steel Surface Engineering Technology Co., Ltd., Maanshan Anhui 243021, China;
2. Research Center of Modern Surface & Interface Engineering, Anhui University of Technology, Maanshan Anhui 243000, China

Received:2019-12-24 Online:2020-06-25 Published:2020-09-02

摘要/Abstract

摘要： 采用激光合金化技术在球墨铸铁QT600-3表面制备镍基合金强化层,通过XRD、SEM和摩擦磨损试验等研究了不同激光扫描速率对合金化层物相、微观结构、力学性能、常温和高温摩擦学性能的影响,并使用Raman光谱仪对磨痕进行分析。结果表明:Ni合金化层与基体冶金结合好、显微硬度高(高达720 HV0.1)、高温摩擦因数低至0.305、高温磨损率低至7.55×10^-6 g·N^-1·m^-1。随着扫描速率的增加,显微组织更加致密,显微硬度先升高后降低,700 ℃耐磨性能提高,但合金化层裂纹率增加。高温摩擦磨损过程中,合金化层的磨损机制以磨粒磨损为主,同时还存在疲劳磨损和氧化磨损。同时,扫描速率的增加可细化晶粒和提高显微硬度。而Ni合金化层表面在高温摩擦过程中形成的氧化产物和碳化物在高温下会对提高其耐磨性能产生积极作用。

关键词: 激光合金化, Ni基合金化层, 扫描速度, 高温磨损

Abstract: Ni-based alloyed layer was prepared on the surface of ductile iron QT600-3 by laser alloying. The phase composition, microstructure, mechanical properties, tribological properties at room temperature and high temperature of the alloyed layer were investigated by means of XRD, SEM, tribological tests and Raman spectrometer. The test results show that Ni-based alloyed layer exhibits good metallurgical bonding to the substrate, high microhardness (up to 720 HV0.1). At high temperature, its friction coefficient is less than 0.305 and wear rate is less than 7.55×10^-6 g·N^-1·m^-1. With the increase of laser scanning speeds, the microstructure becomes more denser, the microhardness increases first and then decreases, and the wear resistance at 700 ℃ increases, but the crack rate of the alloyed layer increases. During high temperature friction and wear experiment, the wear mechanism of the alloyed layer is mainly abrasive wear, fatigue wear and oxidation wear. Also, the increase of scanning speed improves the grain refinement and increases the microhardness. The wear products and carbides produced on the surface of the alloyed layer during high temperature wear play a positive role in improving wear resistance.

Key words: laser alloying, Ni-based alloyed layer, scanning speeds, high temperature wear resistance

中图分类号:

TG174.4

王硕煜, 张林, 解明祥, 叶文虎. 球墨铸铁轧辊表面镍基激光合金化层及其磨损性能[J]. 金属热处理, 2020, 45(6): 220-225.

Wang Shuoyu, Zhang Lin, Xie Mingxiang, Ye Wenhu. Ni-based laser alloyed layer on ductile iron roller surface and its wear properties[J]. Heat Treatment of Metals, 2020, 45(6): 220-225.

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球墨铸铁轧辊表面镍基激光合金化层及其磨损性能

Ni-based laser alloyed layer on ductile iron roller surface and its wear properties

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